Log Message:
Pullup ticket #5927 - requested by markd
x11/qt5-qtbase: build fix

Revisions pulled up:
- x11/qt5-qtbase/Makefile                                       1.74
- x11/qt5-qtbase/files/qmake.conf                               1.9

---
   Module Name:	pkgsrc
   Committed By:	markd
   Date:		Mon Apr  1 19:58:51 UTC 2019

   Modified Files:
   	pkgsrc/x11/qt5-qtbase: Makefile
   	pkgsrc/x11/qt5-qtbase/files: qmake.conf

   Log Message:
   qt5-qtbase: fix setting QMAKE_COMPILER

   QMAKE_COMPILER is meant to signify the compiler family being used
        gcc              for gcc
        gcc clang llvm   for clang
   should properly fix the build issue seen on CentOS and likely other
   systems.